Antibiotics for Stomach

(not sure where this should go, so i'll drop it in training)
Whenever I'm abroad I get sick (bad stomach). Doesn't seem to matter where I go, by day 3 it's not good, which is usually when the big ride or sportive is taking place.
The only time I've been ok is while taking malaria tablets (Malarone, which I think is an antibiotic?).
So are there specific antibiotics available for stomach issues?, would they help? where to get them? and is there a downside to taking them?
ta
Whenever I'm abroad I get sick (bad stomach). Doesn't seem to matter where I go, by day 3 it's not good, which is usually when the big ride or sportive is taking place.
The only time I've been ok is while taking malaria tablets (Malarone, which I think is an antibiotic?).
So are there specific antibiotics available for stomach issues?, would they help? where to get them? and is there a downside to taking them?
ta

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I am not a doctor, and I don't know why taking Malarone might settle your stomach. Many antibiotics cause upset stomachs, but an antibiotic called Xifaxan has been heavily marketed for treating "traveller's tummy" and diarrhoea. I would strongly advise that you talk to someone with actual medical expertise.
Oh, and I assume you're following sensible food and drink hygiene while you're away?